Finding the Fourth Proportional to 9,409.59, 12,985.16 and 5,160.53

Step by Step Solution

1. Step 1: Write the proportion equation
   9,409.59 : 12,985.16 = 5,160.53 : x
2. Step 2: Convert to fraction form
   9,409.59/12,985.16 = 5,160.53/x
3. Step 3: Cross multiply
   9,409.59x = 12,985.16 × 5,160.53
4. Step 4: Simplify right side
   9,409.59x = 67,010,217.01
5. Step 5: Solve for x
   x = 67,010,217.01/9,409.59
6. Step 6: Final answer
   x = 7,121.48